interval numbers are values on a linear modified scale with a man-defined zero point, the ratio and proportion determinations are not as useful. Time of day, years on a calendar, the temperature, and PH value are all examples of interval measurements.
INTERVAL
Meaning of INTERVAL in English
Sean Woo's Finance, GIS and real estate English glossary. Английский глоссарий по ГИС(Географическая информационная система) и недвижимости Sean Woo's Finance. 2012